The value of $\frac{cot30^{0} - cot75^{0}}{tan15^{0} - tan60^{0}}$ is equal to

The value of $\frac{cot30^{0} - cot75^{0}}{tan15^{0} - tan60^{0}}$ is equal to
1). -1
2). 0
3). 1
4). 2

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